sparc: fix livelock in uaccess

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sparc equivalent of 26178ec11e "x86: mm: consolidate VM_FAULT_RETRY handling"
If e.g. get_user() triggers a page fault and a fatal signal is caught, we might
end up with handle_mm_fault() returning VM_FAULT_RETRY and not doing anything
to page tables.  In such case we must *not* return to the faulting insn -
that would repeat the entire thing without making any progress; what we need
instead is to treat that as failed (user) memory access.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

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Al Viro 2023-01-31 00:03:40 -05:00

parent dce45493af

commit 79c54c97c7

2 changed files with 10 additions and 2 deletions

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5

arch/sparc/mm/fault_32.c

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7

arch/sparc/mm/fault_64.c

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